{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SU9156-7VK20","brand":"Siemens","brandSlug":"siemens","productSlug":"5SU9156-7VK20","canonicalUrl":"https://aoctrl.com/siemens/5SU9156-7VK20","factsUrl":"https://aoctrl.com/api/mcp/products/5SU9156-7VK20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SU9 series, RCD-operated circuit breaker, 2-pole 1P+N, 20 A, Type A, C-curve, 6 kA (EN 60898), 10 kA (IEC 60947-2), 50 Hz, IP20.","salesMarkdown":"The Siemens 5SU9156-7VK20 is a SENTRON RCBO — an RCD-operated circuit breaker that combines overcurrent protection and residual current detection in a single 2-module (36 mm wide) unit. ## Derating that matters for panel builders The 5SU9156-7VK20 carries a full derating table from 30 °C to 55 °C: 20 A at 30 °C, 18.8 A at 40 °C, 18.2 A at 45 °C, 17.4 A at 50 °C, and 16.2 A at 55 °C. If the distribution board ambient sits at 45 °C — common in a sealed enclosure — the usable continuous current drops to 18.2 A, so a 20 A load would nuisance-trip on a warm day. Plan the branch circuit load at the derated figure, not the label. That 35 mm² upper end is unusual for a 20 A RCBO — it means the terminals are oversized for the rating, making daisy-chaining or looping through larger feed conductors straightforward. Strip length and torque values follow the standard SENTRON terminal spec; no special crimp lugs needed for the full range. ## Mounting and clearance notes IP20 applies when the distribution board is installed with conductors connected — exposed terminals are touch-protected per the product feature listing. Halogen-free and silicon-free construction, which matters for installations with sensitive electronics or where low-smoke, zero-halogen cabling is specified. Energy limiting class 3, meaning it limits let-through energy well in a fault condition.","metaTitle":"Siemens 5SU9156-7VK20 SENTRON RCD Circuit Breaker, 20 A Type","metaDescription":"Siemens 5SU9156-7VK20 SENTRON RCD-operated circuit breaker, 20 A rated, Type A fault current, C-curve, 6 kA (EN 60898) / 10 kA (IEC 60947-2). Current production. Available to order","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Depth":"77 mm","Solid":"0.75 ... 35 mm²","Width":"36 mm","Height":"90 mm","Maximum":"1.5 W","Stranded":"0.75 ... 35 mm²","at 30 Cel":"20 A","at 40 Cel":"18.8 A","at 45 Cel":"18.2 A","at 50 Cel":"17.4 A","at 55 Cel":"16.2 A","Halogen-Free":"Yes","Silicon-Free":"Yes","During Storage":"-40 ... +75 °C","Number of poles":"2","Type of voltage":"AC","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Ambient temperature":"-25 ... +45 °C","Product designation":"RCD-operated circuit breaker","Protection class IP":"IP20, if the distribution board is installed, with connected conductors","Overvoltage category":"III","Energy limiting class":"3","Number of width units":"2","Type of fault current":"A","Number of poles / Note":"1P+N","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","circuit-breaker / Design":"5SU9","Current / at AC / rated value":"20 A","Tripping characteristic class":"C","acc. to EN 60898 / rated value":"6 kA","For Testing Equipment / Minimum":"125 V","Position / of power supply cord":"Either top or bottom","Number of poles / with protection":"1","acc. to IEC 60947-2 / rated value":"10 kA","Product feature / Touch protection":"Yes","Supply voltage frequency / rated value":"50 Hz","Tripping residual current / rated value":"10 mA","Influence of the surrounding temperature":"Max. 95% humidity","Surge current resistance / at (8/20) μs":"1 kA","Tightening torque / with screw-type terminals":"2.5 ... 3 N·m","Product function / neutral conductor switching":"Yes","Mechanical service life (switching cycles) / typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/aeea9c22a47795dda4cd91aebfb8c5e8.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=629243&mlfb=5SU9156-7VK20","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SU9156-7VK20/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of the 5SU9156-7VK20?","answer":"6 kA rated value per EN 60898 for domestic-type installations, and 10 kA rated value per IEC 60947-2 for industrial panel applications."},{"question":"What conductor sizes does the 5SU9156-7VK20 accept?","answer":"Solid and stranded conductors from 0.75 mm² up to 35 mm²."},{"question":"Where can I buy the 5SU9156-7VK20?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SU9156-7VK20","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/siemens/5SU9156-7VK20 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}